Inner diameter: 7 cm

Author Sean Marsh uses chess heroes like Karpov and Tal to illustrate advanced strategies

Producer: Harrows

you slam the frame down so that the 3x3 pieces in the middle are framed in the empty space

The board has one column for each possible total of two six-sided dice

Logic Lucy Cold Hearts Puzzle Book Go Inner diameter: 7 cmIn this puzzle book by Jeppe Norsker, you have to fill the circles with the numbers 0 9, where each number can only be used once. The numbers that are already placed outside the circles give you the crucial clues, as they represent the sum of the numbers in the connected circles. Each puzzle starts with one or two hints, but then it's up to you to think, calculate, and rule out possibilities until all the circles are filled. Cold Hearts is perfect for